Rotary pump casing and abutment construction



F. MARION.

ROTARY PUMP CASlNG AND ABUTMENT CONSTRUCTION.

A P P L l C A T I 0 N F l L E D M A R 2 2 1 9 2 0.

' 1,409,054. Patented Mar. 7,1922.

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' struction adapted to be liquids or limit UNITED STATI-:s PATENT oFFicE.

FRANK MARION, OF HARDWICK, VERMONT, ASSIGNOR TO MARION ROTARY MOTORS CORPORATION OF VERMONT.

ROTARY PUMP CASING AND ABUTMENT CONSTRUCTION.

'Specifica tion of Letters Patent.

Patented Mar. 7, 192.2.

App1cation filed March 22, 1920. Serial No. 367,789.

To all /w/mm t may concern.'

e it known that I, FRANK MAmoN, a citizen of the United States, residing at Hardwick, in the county of Caledonia and State of Vermont, have invented certain new and useful Improvements in Rotary Pump Casing and Abutment Constructions, of which the following is a specification.

The invention has for an object to effect improvements in rotary pumps, and particularly aims to simplify the casing and abutment construction. It is a particular object to bring the inlet and outlet ports as closely together as possible with the intervention of the least possible solid elements which would tend to impede the flow of the action ofthe pump. A to give a pumpcasing conreadily cast in one further aim is piece at a low cost.

A further aim is to improve the abutment construction and its mounting in the casing so .that proper engagement'of the abutment with a' cam piston-will be assured without excess friction or waste of power. -A further aim 1s to enable the provision of a device in which the borne against the piston at the discharge side ofthe pump by reason of the pressure therein, whereby the pressure of the abutment will be proportional to Vthat in the discharge pipe. Y

Additional objects, advantages and fea-- tures of invention will appear from the construction, `arrangement and combination of parts hereinafter described and shown in the drawings, wherein,

1- Figure 1 is a vertical sectional view of the pump .constructed in accordance with my invention, 1 Fig.r2 is a cross sectional view thereof,

vFig. 3 is a detail of the abutment member with parts broken away, f i Y Fig. 4 is a fragmentary horizontal cross section of the abutment andadjacent casing part. f Y I There is illustrated a pumpicomprising a casing portion including a bo'dycasting 10 aving a cylindrical chamber- 11 therein closed by a cover plate 12, the casting 10 including a back plate portion 13 provided with a bearing 14 therein alined with-a similar bearing 15 on the plate 12. The body castingv is formed with Va vertical eXtension14 at the base of which inlet and outlet pasabutment will bel securelyV the outlet 16 is formed with sages 15 and 16 are formed co-axially, having at their outer ends terminal tapped ex-v tensions 17 with which pipe connections may be readily made. A port 18 is formed opening from the chamber 11 centrally beneath the extension` 14 offset beyond the vertical center of the device in the direction of the outlet passage 16. A shaft 19 is mounted in the bearings 14 and 15 upon which shaft a cam piston 2O is secured, the shaft extending a distance beyond the casing at one side and having a pulley 21 mounted thereon. In the vertical extension 14 there is formed a vertical guide passage 22, alined with the port 18, the passage beingr smoothlyfinished and having slidably engaged therein an abutment member 23 in the form of a plate of a thickness much less than the circumferential width of the port 18 so that theplate may extend slidably therethrough leaving a clearance on each side suilicient to provide for ingress and egress of liquid during the operation of the pump from and to the passages 15 and 16 respectively. The plate is formed with a head portion 24 snugly fitted in the passage 22, which is somewhat largerv than the cross sectional measurement of the plate 23, and in the present instance being snugly engaged against the surfaces of thc passage 22 which is coincident in size with the port 18. A spring 25 bears upon the upper side of the head 24 at each side, these springs being engaged through reduced bores 26 formed through the upper outer part of the extension 14 and closed by a cap 27, by which means the springs are suitably confined. Opening from. the passage 22 from one side there is` an oil duct 28 in communicationwith an oil'cup 29. The head 'portion 24 in 'this construction projects on opposite sides of the abutment, and on the side next .an-aperture 30 formingY communication between the outlet passage 16 or compression side of the pump andthe passage-22, at that side only. The plate portion of the abutment vis also provided with downward extensions 31, two at each side, receiving the piston 20 snugly therebetween, and engaged in suitable grooves -32 formed in the plates 12 and 13 of the casing. A groove 33 is formed on each edge of the abutment plate the bottomv of which is inV a plane with ythe inner faces of the extensions.31. Grooves of similar width to the grooves 33 are formed intermedi- Y )aclrinff devices -l parts, and

33 and 3&1, there are wedge-shaped packing ately of the grooves 32 in the plates 12 and 13, and numbered 34, these last named grooves having bottom portions sloped` inwardly from their upper parts to their lower slidably engaged in the grooves bars 35, having their inner sides disposed in a vertical plane alined with the adjacent inner surfaces of the plates 12and V13, and adapted to permit free sliding movement of the abutment, and rotation of the piston, While engaging snugly against the sides of the piston, extending as Vclose as possible to or beyond the bottom of the chamber 11, so as to close o side of the pump. The extensions 31 extend downwardly to one side of the shaft 19, the 35 may extend the full height of the chamber 11 without interference or complication with the shaft of the piston. Suitable springs 36 bear upon the upper ends of the bars 35, being adjustable by means of suitable screws 37 engaged through the upper part of the body casting. In operation, in the initial movement of the pump before appreciable pressure has been developed Yin the passage 16, the springs 25 will serve to Y hold the abutment in proper I engagement with the piston. At this time,

l is'high than when it is in case there is much suction involved, atmospheric pressure upon the.liead 24C will also aid in maintaining the abutment properly seated,`so that but little forceis re`- uiredto be exerted by the springs 25 and t erefore the friction due to the action of these'springs will be but slight. The pressure induced by suction and subsequently by rising pressure in the outlet 16 will pro- Y`mote the efiiciency 'of the device in preventing escape of liquid under the abutment from the outlet to the inlet side when the deviceisin operation,"t being understood that this tendency is greater when the pressure low, so that less pressure would be required on the abutment where low pressures are involved. By the action of liquid in the outlet 16 operating through the opening 30 upoiithe 'upper s ide offthe head 24,'the device will automatically proportion the pressure upon the abutment to suit the service to which the pump is applied.

i' The pressure at the outlet side of the pump l groove '32, and

willlalso bear the abutment toward the inlet side, causing it Vto `engagefthesifdes of the when that is worn, the vbars 35,V which will also be borne against the sidesV of the tapered grooves 34C.' -As .the bars V35 become worn byr friction of the abutment and of the piston 20, they will automatically slide `inwardly by the laction of the springs,

maintaining a 'water-tight joint' at 'all times. The bars 35 preferably project into recesses in the casting 10 below if-the inlet side from the outletl `sides of the casing ber 'both .beingv located in a Y plane V"parallel to and voffset from the shaft slidable to the ch'amberil, but various. modifications of the constructions may be followed as found desirable.

That isfclaimed z. v.

1. A pump comprising a casinghaving a circular chamber therein anda cam piston mounted revolubly in the chamber, a shaft carrying the piston coaxially of the chamber and projected through the side of the casing, the casing having an extension, offset from a parallel line through the axis of the shaft toward the outlet side of the pump, a guide passage being formed therein and an alined port communicating with the chamber, inlet and outletA passages opening toward each other immediately outward of the port Yand in communication therewith, said casing being formed with terminal pipe receiving parts at the passages, an abutment element snugly slidable between Vopposite sides of the chamberincluding a plate portion medially disposed in said port and a head portion snugl engaged in said passage, whereby a division is formed'between the inlet and outlet passages, said head "portion being apertured on the outlet side, and a-.wedgel shaped packing member mountedin opposite having parallel sides ex-v posedv therein and engaging snugly the ypiston and abutment.. Y

2. In a'device of the characterdesc'ribed, a casing comprising a Vcircular chamber having parallel sides, a concentric shaft there# across, an eccentric cam piston on the shaft, a `ort formedin the casing opening from said chamber, said casing vhaving Va guide extension outwardly from and in line with the port, inlet andoutlet passages formed in the casing lopening into opposite" sides of the port, an abutment memberincluding a'plate portion intermediately disposed'in the port and having a head portion slidably engaged in said extension, the head` portionV being projected a distance over said port at the inlet side, coimnunication being formed in tliefdevice between the compression side rved in thecasing, and VLfpalring device at each 'side lincluding a wedge-shaped memcompensate Vfor' wear, engaging Vsnugly against said pistonandabutment and means Ato adjust the wedgefsliaped members Y I n5testimony whereof I have.V affixed my signature in presence of two witnesses.

-Witnesses: f

. FRED L. lLA-i'ni),

.Mem GfNm..

of the chamber and theV outer side Vof saidY FRANK MARION.YY 

